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/*
* Copyright (c) 2023 Stalwart Labs Ltd.
*
* This file is part of Stalwart Mail Server.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
* in the LICENSE file at the top-level directory of this distribution.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* You can be released from the requirements of the AGPLv3 license by
* purchasing a commercial license. Please contact licensing@stalw.art
* for more details.
*/
use jmap_proto::{
error::method::MethodError,
method::{
query::Filter,
search_snippet::{GetSearchSnippetRequest, GetSearchSnippetResponse, SearchSnippet},
},
types::{acl::Acl, collection::Collection},
};
use mail_parser::{decoders::html::html_to_text, Message, PartType};
use store::{
fts::{
builder::MAX_TOKEN_LENGTH,
search_snippet::generate_snippet,
stemmer::Stemmer,
term_index::{self, TermIndex},
tokenizers::Tokenizer,
Language,
},
BlobKind,
};
use crate::{auth::AccessToken, JMAP};
use super::index::MAX_MESSAGE_PARTS;
impl JMAP {
pub async fn email_search_snippet(
&self,
request: GetSearchSnippetRequest,
access_token: &AccessToken,
) -> Result<GetSearchSnippetResponse, MethodError> {
let mut filter_stack = vec![];
let mut include_term = true;
let mut terms = vec![];
let mut match_phrase = false;
for cond in request.filter {
match cond {
Filter::Text(text) | Filter::Subject(text) | Filter::Body(text) => {
if include_term {
let (text, language) = Language::detect(text, self.config.default_language);
if (text.starts_with('"') && text.ends_with('"'))
|| (text.starts_with('\'') && text.ends_with('\''))
{
terms.push(
Tokenizer::new(&text, language, MAX_TOKEN_LENGTH)
.map(|token| (token.word.into_owned(), None))
.collect::<Vec<_>>(),
);
match_phrase = true;
} else {
terms.push(
Stemmer::new(&text, language, MAX_TOKEN_LENGTH)
.map(|token| {
(
token.word.into_owned(),
token.stemmed_word.map(|w| w.into_owned()),
)
})
.collect::<Vec<_>>(),
);
}
}
}
Filter::And | Filter::Or => {
filter_stack.push(cond);
}
Filter::Not => {
filter_stack.push(cond);
include_term = !include_term;
}
Filter::Close => {
if matches!(filter_stack.pop(), Some(Filter::Not)) {
include_term = !include_term;
}
}
_ => (),
}
}
let account_id = request.account_id.document_id();
let document_ids = self
.owned_or_shared_messages(access_token, account_id, Acl::ReadItems)
.await?;
let email_ids = request.email_ids.unwrap();
let mut response = GetSearchSnippetResponse {
account_id: request.account_id,
list: Vec::with_capacity(email_ids.len()),
not_found: vec![],
};
if email_ids.len() > self.config.get_max_objects {
return Err(MethodError::RequestTooLarge);
}
for email_id in email_ids {
let document_id = email_id.document_id();
let mut snippet = SearchSnippet {
email_id,
subject: None,
preview: None,
};
if !document_ids.contains(document_id) {
response.not_found.push(email_id);
continue;
} else if terms.is_empty() {
response.list.push(snippet);
continue;
}
// Obtain the term index and raw message
let (term_index, raw_message) = if let (Some(term_index), Some(raw_message)) = (
self.get_term_index::<TermIndex>(account_id, Collection::Email, document_id)
.await?,
self.get_blob(
&BlobKind::LinkedMaildir {
account_id,
document_id,
},
0..u32::MAX,
)
.await?,
) {
(term_index, raw_message)
} else {
response.not_found.push(email_id);
continue;
};
// Parse message
let message = if let Some(message) = Message::parse(&raw_message) {
message
} else {
response.not_found.push(email_id);
continue;
};
// Build the match terms
let mut match_terms = Vec::new();
for term in &terms {
for (word, stemmed_word) in term {
match_terms.push(term_index.get_match_term(word, stemmed_word.as_deref()));
}
}
'outer: for term_group in term_index
.match_terms(&match_terms, None, match_phrase, true, true)
.map_err(|err| match err {
term_index::Error::InvalidArgument => {
MethodError::UnsupportedFilter("Too many search terms.".to_string())
}
err => {
tracing::error!(
account_id = account_id,
document_id = document_id,
reason = ?err,
"Failed to generate search snippet.");
MethodError::UnsupportedFilter(
"Failed to generate search snippet.".to_string(),
)
}
})?
.unwrap_or_default()
{
if term_group.part_id == 0 {
// Generate subject snippent
snippet.subject =
generate_snippet(&term_group.terms, message.subject().unwrap_or_default());
} else {
let mut part_num = 1;
for part in &message.parts {
match &part.body {
PartType::Text(text) => {
if part_num == term_group.part_id {
snippet.preview = generate_snippet(&term_group.terms, text);
break 'outer;
} else {
part_num += 1;
}
}
PartType::Html(html) => {
if part_num == term_group.part_id {
snippet.preview =
generate_snippet(&term_group.terms, &html_to_text(html));
break 'outer;
} else {
part_num += 1;
}
}
PartType::Message(message) => {
if let Some(subject) = message.subject() {
if part_num == term_group.part_id {
snippet.preview =
generate_snippet(&term_group.terms, subject);
break 'outer;
} else {
part_num += 1;
}
}
for sub_part in message.parts.iter().take(MAX_MESSAGE_PARTS) {
match &sub_part.body {
PartType::Text(text) => {
if part_num == term_group.part_id {
snippet.preview =
generate_snippet(&term_group.terms, text);
break 'outer;
} else {
part_num += 1;
}
}
PartType::Html(html) => {
if part_num == term_group.part_id {
snippet.preview = generate_snippet(
&term_group.terms,
&html_to_text(html),
);
break 'outer;
} else {
part_num += 1;
}
}
_ => (),
}
}
}
_ => (),
}
}
}
}
response.list.push(snippet);
}
Ok(response)
}
}
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